EA6900 Antenna's for maximum signal and low noise

I noticed when I was hooking up the antennas that I had to be careful they were fully screwed on. When tightening they felt like they are all the way on but weren't.
If you have a wireless antenna whose connector isn't all the way on it lowers the wireless signal and creates significant radio noise. The higher the frequency the worse it is.
Please remember to Kudo those that help you.
Linksys
Communities Technical Support

Hi markemerson,
As far as I know, Linksys do have a high gain antenna, model number HGA7T. It has been tested to work with older routers listed from this LINK but i'm not pretty sure if it has been tested to work with the newer models like the EA6900.

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IPAD 3 Antenna Sensitivity for Cellular Signals.

My IPAD is deaf to celluar signals.
I know IPHONES are bad for cellular antenna sensitivity, but the IPAD 3 I have make them look like superstars.
With the IPHONE I get three bars on the signal and a marginal 4g or 3g connection. The IPAD never connects. Same spot, same option of 4g or 3g connection.
The Wi-Fi connection is fine.
Any ideas on how to fix this problem?? Is my IPAD unique or is this typical for the species?

I don't know whether it should matter technically, but there are separate plans for LTE data, even on "domestic iPad" plans. When I switched from an iPad 1 to an iPad 3 (also in March 2012) and wanted to get LTE, I had to switch to a plan called "250 MB of data for 30 days - LTE" (where previously it had been called "DOM 250 MB for 30 days"). Same price, same separate account, both plans prepaid, different plan name, different signal access. I'm still on the second plan.
AT&T changes rate plans from time to time. They may not be offering the "250 MB of data for 30 days - LTE" plan to new customers these days. If so, I must be grandfathered into the old plan. They do still offer a 3G session-based plan according to their website.
Disclaimer: I'm in a different AT&T area (former Southwestern Bell territory), so plans might differ in your area.

How to do carrier phase measurement of any RF signal and Phase Noise measurement of any RF signal?

Hello,
Can any one give some idea to do carrier phase measurement and Phase Noise measurement of any RF signal?
Regards,
Vijay

Vijay,
A great example for measuring RF phase noise can be found in the LabVIEW Example Finder. The name of the VI is "MT RFSA Phase Noise.vi" This example performs phase noise density measurements on I-Q data acquired using RFSA. You may also want to take a look at Performing Modulation Measurements on Real-World IQ Data With Carrier Frequency Drift to see if phase measurement could be implemented: http://sine.ni.com/apps/we/niepd_web_display.display_epd4?p_guid=EEAFD63A09CD3B79E0340003BA7CCD71&p_node=200054&p_source=External
What type of RF signal would you be analyzing? Are you trying to measure phase shift of a carrier frequency that is varying with time?
Shea C
Applications
NI

Approval with UDF for blank price and lower than standard price

Dear all experts,
would like to know if it is possible for the following 2 events trigger at the same time?
background:
1. a UDF - Standard price retrieve from price list
2. a UDF - blank approval (with selection Yes and No, default is No, it is document level UDF)
3. a UDF - unit price lower than standard price (with selection Yes and No, default is No, it is document level UDF)
Approval event would like to have
1. If the field - Unit Price is blank -> user need to set the UDF "blank approval " to Yes, so can add the document
2. If the field - Unit Price is lower than the field - Standard Price -> user need to set the UDF "unit price lower than standard price to" Yes, so can add the document
i tired the following, but only one of them work when i press the button Add .....
Please kindly help on this.....
Many thanks!!
USE [ANJ_QAS]
GO
/****** Object: StoredProcedure [dbo].[SBO_SP_TransactionNotification] Script Date: 03/07/2011 00:44:31 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER proc [dbo].[SBO_SP_TransactionNotification]
@object_type nvarchar(25), -- SBO Object Type
@transaction_type nchar(1), -- [A]dd, pdate, [D]elete, [C]ancel, C[L]ose
@num_of_cols_in_key int,
@list_of_key_cols_tab_del nvarchar(255),
@list_of_cols_val_tab_del nvarchar(255)
AS
begin
-- Return values
declare @error int -- Result (0 for no error)
declare @error_message nvarchar (200) -- Error string to be displayed
select @error = 0
select @error_message = N'Ok'
-- ADD YOUR CODE HERE
-- 1. SO with blank price then trigger approval
If @object_type = '17' AND @transaction_type = 'A'
BEGIN
 SET @error_message =
 (SELECT TOP 1 ItemCode + ' (' + CAST(LineNum AS NVARCHAR(5)) + ')' +
 CASE WHEN Price = 0
 THEN ' Price is blank. Please change UDF - Null Price Approval to "Yes"'
 ELSE ''
 END
 FROM RDR1 T0
 WHERE DocEntry = @list_of_cols_val_tab_del
 AND 1 = (CASE WHEN (Price * (100 - ISNULL(DiscPrcnt,0)) / 100) = 0 THEN 1
 ELSE 0 END)
 AND EXISTS (SELECT 1
 FROM ORDR S0
 WHERE S0.DocEntry = T0.DocEntry AND ISNULL(S0.U_NullPrice,'N') = 'N') )
 IF ISNULL(@error_message,'') <> ''
 BEGIN
 SET @error = '-10001'
 END
END
-- 2. field price after discount < field rock bottom price for SO, then trigger approval
If @object_type = '17' AND @transaction_type = 'A'
BEGIN
 SET @error_message =
 (SELECT TOP 1 ItemCode + ' (' + CAST(LineNum AS NVARCHAR(5)) + ')' +
 CASE WHEN ISNULL(Price,0) < ISNULL(U_rockprice,0)
 THEN ' Price:' + CAST(ISNULL(Price,0) AS NVARCHAR(30)) + ' Lower Than Rock Bottom Price: ' + CAST(ISNULL(U_rockprice,0) AS NVARCHAR(30)) + ' Please change UDF - RB Approval to "Yes"'
 ELSE ''
 END
 FROM RDR1 T0
 WHERE DocEntry = @list_of_cols_val_tab_del
 AND 1 = (CASE WHEN ISNULL(Price,0) * (100 - ISNULL(DiscPrcnt,0)) / 100 < ISNULL(U_rockprice,0) THEN 1
 ELSE 0 END)
 AND EXISTS (SELECT 1
 FROM ORDR S0
 WHERE S0.DocEntry = T0.DocEntry AND ISNULL(S0.U_RBApproval,'No') = 'No') )
 IF ISNULL(@error_message,'') <> ''
 BEGIN
 SET @error = '-10001'
 END
END
-- Select the return values
select @error, @error_message
end
Edited by: tac wong on Mar 14, 2011 6:36 PM

Hi Sachin,
Please create a separate thread for question 2.
With regard to point 1, there is a good description in the SAP help :
http://help.sap.com/saphelp_srm2007/helpdata/en/74/344c430fab4d0bbc30996d56cc293a/frameset.htm
Functions -> Approval Process Frameowrk -> Approval Workflow ->
Approval with Completion
and
Approval
Kind regards,
Siobhan

E1200 Router with poor signal and low speeds

Hello, I just bought an E1200 router, which is downstairs and about 50 ft away from me. I have only about 60% signal strength, and my speed test when connected wirelessly is only 5mbit up,4mbit down. I plugged my computer into the router via ethernet and I get 30mbit up, and 5mbit down.
Are there any settings you could suggest to improve this? I tried several channels already, none above 60% it seems.
Thanks!

first>> http://www6.nohold.net/Cisco2/ukp.aspx?vw=1&docid=0a6881b90224439b92c8d8f19ca42e5d_21511.xml&pid=80&...
second>> reset the router. there is a button at the bottom, press and hold it for 10 seconds then leave it for 2 minutes.
third>> reinstall the router using the setup cd.

Do we have any sollution for dropping signals and invalid sim or sim failiure

can someone tell me how to fix the problem of dropping signals then searching catch network make one or two calls and again call failed and the process starts repeating again as i have restored my handset with itunes with a latest 5.0.1 94a406 but no use? please help if some one can.

Follow the suggestions in this article:
http://support.apple.com/kb/TS1398
Normally it's pretty easy to setup a Wifi Connection. Good Luck!
Let us know what happens

No video signal and wierd noises

I put together a new system with the 865pe neo 2 about a week and a half ago. Had to clear the CMOS to get a boot initially but since then the system has worked fine (except for an ongoing problem with com1..).
Last night I loaded UT2003 demo and played it for about 45 minutes then I powered down. This morning I started to get alerts from core centre that the 3.3v was down around 2.9-2.84. Then my video signal started cutting out (screen goes blank for a second) then finally the system froze. I rebooted and checked the bios (I'm using standard boot with no overclocking) As the day went on the system became more and more difficult to boot. At first I could get to the OS but it would quickly freeze. Then I could get into the BIOS but then the screen pixelated and then froze. On occasion the system would show 4 red lights and give me the 2 tone alarm. (Good God I hope its not the CPU) At this time I have no video signal at all. I tried another monitor..no go. I am using a good power supply (Enermax 365P-ve). Now the system POSTs okay but refuses to go any further (still no video though)
Do you think my ATI is toast? How could it just stop working? Does the loss of video card have such an effect on the boot up?
Any thoughts would be appreciated. I am at my wits end.
prouja

No I haven't tried a different power supply. All my other computers are PIII and use ~300W supplies.
I did try the ATI video card in an old computer and it didn't give my any problems so now I am thinking maybe the RAM or as you said the power supply.
Is there any way to test the output of the power supply? I have a digital multitester but I'm not great with it.
Could RAM issues cause the problems I encountered?
As an update the computer now makes 2 long and then 8 short beeps at startup and then hangs at keyboard initialization (as shown by the 4 leds at the back) Of course this started after I tried clearing the CMOS (power off).

Antenna Selection for High ceiling (Warehouse)

i read nearly 500 topic on antenna selection for high ceiling and industrial warehouse environments (~10m ceiling)
Question1 : both ant2544v4 and Ant2524 has ~60 degrees Elevation plane 3 dB beamwidth does it mean this Omni antenna could be mounted on 10m height without coverage issue ?
Question2:suppose installing plenty of 2702 with Ant2524 or Ant2544V4 in close adjacency , does CleanAir2 helps to avoid interference ?
Question3:if i want avoid directional antennas to cover aisles using dipoles is the last solution ? (if omni antenna cant afford enough elevation due to its nature )
my warehouse area is something like this : http://www.pathguide.com/Images/Content/warehouse%20aisle.jpg
thanks

As I can see this location presents challenging RF conditions: high attenuations, reflections, multipath, etc. The fact that you need to implement Voice WLAN too, introduces more difficulties.
You have to conduct a wireless site survey. I don't know how much experience do you have with this activity or if you have the equipment and site survey tools required, but it has to be done.
In the worst case scenario you have to grab at least one or two APs from the model that you intend to install, set them up in stand alone mode with some test SSIDs and install them in the warehouse in different locations. Than you walk arround and try to measure the signal quality and attenuations. You cand use some free or trial site survey applications that can be found on the Internet.
You have to find out what protocol (802.11 a/b/g/n) the barcode scanners are using and what TX power are they capable of. You should set up your APs accordingly (the AP TX power should not exceed the client power, preferably it should be about half in order to benefit of CHD). The same has to be done for the Voice clients. The survey has to be done separately for each 802.11 protocol. I recommend taht you do some futher reading on the subject.
As for the antenna type, Cisco recommends directional antennas in high ceiling environments. However, I have installed 2702e APs with standard omni antennas in warehouses and they did the job very well. The difference in my case was that I installed the APs on cable channels at ~6-7 meters, not directly on the ceiling. Maybe you can find some other mounting possibilities besides the ceiling if you want to stick to omni antennas.
The co-channel interference between adjacent APs is avoided usualy by DCA and TPC not as much by CleanAir. However in 2.4 GHz there could be some interferences.
As a conclution you have to use some real APs in order to estimate, with at least a minimal accuracy, the position and number of required APs for the deployment. Do not forget about the cabling requirements for the APs, distances to the closest switch, electrical power etc.

Travel Management-Receipt Maximum rates and Default values

Hi
I need some help on one of the issue we are facing in Travel Management. We are expected to Go-live very soon.
We are unable to apply a very basic check of receipt maximum amount at
the receipt entry in the portal for travel expenses. This functionality
is very much provided by SAP in the backend configuration but it is not working in the backend also in our Development system.
This is concerning the maximum and default amounts in
View V_T706B2 are related to the IMG
"Define Influence of Control Parameters: Receipt Maximum Rate"
I have analysed the table entries but could not
get the desired solution.
In the meanwhile based on SAP note: 808437-Warning message when max
rate is exceeded negative value, we looked into the code and found that
the code for checking the maximumum amounts is "commented" in the
lastest SP32 SAP HR version in the DEVELOPMENT system we are working
on.
I also looked into (SAP Note: 1114398---Country and Region when
reading maximum amounts and defaults) and have found that the
correction suggested in this note may already be applied as our D35
System EA_HR patch level is already SAPK-60211INEAHR and Note
correction in SAPK-60203INEAHR is of old level, hence we have not applied this correction.
Furthermore I have checked and found that in our IDES system these checks
for Maximum amounts and defaults are working fine. The IDES system is
at level 0002 and highest support package is SAPKE60002.
Many thanks in advance !
Ritesh

Hi Ritesh:
We had a situation in which our expense types require both a warning message and request for additional information when the maximum is exceeded. We were told that ECC6.0 can handle only one action per expense type/amount. In our old system, R4.6C, it could handle multiple actions per amount for a receipt type.
I am not sure if this is your issue - having multiple actions for a expense type/amount combination.
We got around this by leaving one action at the expected amount and setting the other to 0.01 lower.
Lisa

Connecting USB6343 onboard 5v to AI 4 5 6 7 through 4 switches and AI GND results in floating signals and noise

Hey,
I am connecting USB6343's onboard 5v source to AI 4 5 6 7 through 4 switches (and AI GND). This results in floating signals and sinusoidal noise when i close the switches and not the expected 0v / 5v.
I merely want to report on or off for each switch connected to the AI terminals, what very obvious step am I missing?

I'd like to ask further questions, but being new to the forum, I'm not fully familiar with the customs, so please tell me if I should open a new topic or if it's okay, to bundle questions (if related).
The question are: how to extend the described wiring to multiple switches (I need 10)? I attached my assumption as "Wiring 1.png".
And I guess "Wiring 2" wouldn't work as it'd be how the topic-opener artaxerxes did it?
Attachments:
Wiring 1.png ‏9 KB
Wiring 2.png ‏11 KB

OMR6 upper and lower limits

I am developer and this is not my area of expertise, so not sure if wording will be correct. I believe We place payments blocks on invoices based on values set in OMR6. This is where the configuration is done. However I have been told that the system will not do this for lower limits. Can this be done in OMR6 or is there another area we can do this without having to create a user exit? I'm told that upper limits work fine but that the design of the system does not allow this for lower limits. Anyone have any ideas of where configuration can be done for this?

I had someone here walk me through what was in the setup. For the the Tolerance key "PP" for this specific company there is an upper and lower limit entered and the "check limit" is selected for both upper and lower entries. The upper limit check works but the lower limit check does not work. They said, all SAP notes say you have to enable a specific user exit to get the lower limit to work for "PP". This does not sound right but might be true. Is there something special you have to do with the "PP" type to get it to work? I cannot imagine SAP having the lower limit entry there but not using it, but like I said it is possible.

FPGA velocity estimation and VFD noise

Hi, I'm using an NI FPGA (a 7411, I believe) with an RT unit and VFD to get very low lag, high resolution velocity estimation from a 3600 pulse/rev quadrature encoder (mounted on the VFD driven motor). When the VFD is off and I turn the encoder by hand I get very good tracking and low noise. With the VFD enabled, however, the system is very noisy and usually has about a 1-5% error. The whole system needs to have as little lag as possible (<.01ms).
I'm looking for ways of reducing noise in the system programmatically on the FPGA or of enhancing the noisy signal to make the system more sturdy.

Can you change the switching frequency on the VFD?
Is wiring to motor in conduit? Is conduit metal? If so is it grounded?
Failing that, many cable manufactures now offer armored cable designed just for VFD applications they may reduce radiated emmisions compared standard thre phase cables.

Slow WiFi transmission and low signal power (Airport Extreme extended by Airport Express)

I am experiencing slow wifi transmission between my notebooks and my base stations and I am hoping someone can help me fix it.
My wifi configuration is the following:
1 Airport Extreme base station (acting as router, wifi "creator" and DHCP server)
1 Airport Express base station (connected to Airport Extreme with a LAN cable, set up to extend wireless network)
1 Lenovo T410 notebook with Intel Centrino Ultimate N-6300 AGN WiFi antenna (I will call this one "Lenovo"), connected to wireless network, running Windows 7
1 MacBook Pro purchased in 2009 (I will call this one "Mac"), connected to wireless network, running Mac OS X Lion
1 QNAP T209-II NAS, connected to Airport Extreme via UTP cable
Airport Extreme (AXTRM) is creating a 802.11n wireless network with WPA2+PSK security with MAC address filtering. The other base station, Airport Express (AXPRS) is connected to AXTRM via a UTP cable. AXPRS is set to extend my wireless network.
My first problem is low signal power. My appartment is 90m2 in size and is in one floor. It is a new flat with high ceiling and modern layout, meaning little walls, big rooms and wide corridors. Still my notebooks, iPhones and iPad can barely reach AXTRM when I am on the other side of the flat. This was the reason why I purchased AXPRS and placed it in the middle of the appartment. My notebooks are placed just on the other side of the AXPRS's wall (less than 1 meter of distance and a simple 10cm brick wall in between), yet signal strength is only at about 80% (measured on my Lenovo using Lenovo Access Connections tool).
My first question is: Is it normal that in a 90m2 flat with not unusual obstacles, I need 2 base stations and even then have a rather poor reception?
My second problem is even more disturbing. I think I have catastrophic transfer speeds via wLAN. It takes over 1 hour to transfer cca. 1GB of files (average size 8MB) from my Lenovo or Mac to my QNAP. My Lenovo is showing about 250kb/s transfer rate when copying files. At the same time, Windows 7 show connection speed 144Mbps. This mean about 18MB/s. I know these numbers are theoretical and that actual transfer speeds are lower. But hey, 72 times lower? Furthermore, if I copy files from my Mac and my Lenovo at the same time, transfer speed is slightly lower. On the other hand, if I connect my notebooks to AXTRM via LAN cable and copy files to QNAP, transfer speeds are a few megabytes per second.
To make things even more confusing for me: if I transfer files from the internet, I get download speed at about 700kb/s, which is quite in line with my internet download speed. I don't understand why transfer speeds within my local network are so much lower.
Therefore, my second question is: How to set up my base stations and my routers to get a decent wifi connection?
I hope someone could help me. If you need any more information, just ask. Thanks!

From my experience of setting up the Airport WiFi for family members and friends, I have learnt the following :-
1. Airport Express is not as good as Airport Extreme, for being as extender, the difference can be quite a lot.
2. There is always a dead cornor (bad reception) in a house
3. Even moving the Airport Extreme / AE a few inches, the performance can be improved quite significant
4. If possible, always choose 5G 802.11n than 2.4G, unless there are many thick walls.
My suggestion will be as follows :
1. Moving out the AEBS out of a closet, is a good idea
2. Always try to locate the AEBS in the centre of a area, instead of the two sides
3. Try to test the AEBS without an extender, and find the best location area (don't place on the floor, neither above 6 feet height)
4. After finding a best location, set the extender closer to the AEBS, and then moving apart from it (check the performance after every move), it is better that both devices can face each other.
5. I can't tell you the reason, and some people may not agree with me, the new 2013 Airport Exteme performance is better and may be is a good idea to replace your Airport Express, and use it to connect with your router, and old AEBS as an extender
6. Some Powerlinks (in case you can't use a wired ethernet connection between the two devices) work and some don't work with Apple Airport products, therefore, if possible, have an option to return them to the shop if they do not match
Good luck

I am using the Order Analysis Toolkit and want to get more information about the compensation for "Reference Signal Processing", which is scarce in the manuals, the website and the examples installed with the toolkit.

I am using the Order Analysis Toolkit and want to get more information about the compensation for "Reference Signal Processing", which is scarce in the manuals, the website and the examples installed with the toolkit.
In particular, I am analyzing the example "Even Angle Reference Signal Processing (Digital Tacho, DAQmx).vi", whose documentation I am reproducing in the following:
DESCRIPTIONS:
This VI demonstrates how to extract even angle reference signals and remove the slow-roll errors. It uses DAQmx VIs to acquire sound or vibration signals and a digital tachometer signal. This VI includes a two-step process: acquire data at low rotational speed to extract even angle reference; use the even angle reference to remove the errors in the vibration signal acquired at normal operation.
INSTRUCTIONS:
1. Run the VI.
2. On the DAQ Configurations tab, specify the sample rate, samples per channel, device and channel configurations, and tachometer channel information.
NOTE: You need to use DSA PXI-447x/PXI-446x and PXI TIO device in a PXI chassis to run this example. The DSA device must be in slot 2 of the PXI chassis.
3. Switch to Extract Even Angle Reference tab. Specify the number of samples to acquire and the # of revs in reference which determines the number of samples in even angle reference. Click Start to take a one-shot data acquisition of the vibration and tachometer signals. After the acquisition, you can see the extracted even angle references in Even Angle Reference.
4. Switch to the Remove Slow-roll Errors tab. Click Start to acquire data continuously and view the compensate results. Click Stop in this tab to stop the acquisition.
ORDER ANALYSIS VIs USED IN THIS EXAMPLE:
1. SVL Scale Voltage to EU.vi
2. OAT Digital Tacho Process.vi
3. OAT Get Even Angle Reference.vi
4. OAT Convert to Even Angle Signal.vi
5. OAT Compensate Even Angle Signal.vi
My question is: How is the synchronization produced at the time of the compensation ? How is it possible to eliminate the errors in a synchronized fashion with respect to the surface of the shaft bearing in mind that I am acquired data at a low rotation speed in order to get the "even angle reference" and then I use it to remove the errors in the vibration signal acquired at normal operation. In this application both operations are made in different acquisitions, therefore the reference of the correction signal is lost. Is it simply compensated without synchronizing ?
Our application is based on FPGA and we need to clarity those aspects before implementing the procedure.
Solved!
Go to Solution.

Hi CracKatoA.
Take a look at the link bellow:
http://forums.ni.com/ni/board/message?board.id=170&message.id=255126&requireLogin=False
Regards,
Filipe Silva

My Ipod nano touch is not charging, not showing in my PC or laptop. Last I saw an apple icon and low battery signal. There after the screen is black and no power not taking AC or PC charge. What Can I do?

My Ipod nano touch is not charging, not showing in my PC or laptop. Last I saw an apple icon and low battery signal. There after the screen is black and no power not taking AC or PC charge. What Can I do?

If the Reset didn't work, you'll need to do a Restore.
From iTunes, select the iPad and then select the Summary tab. Follow directions for Restore. You will be warned that all data (apps, music, movies, etc.) will be erased but, as the Restore finished, you will be asked if you wish the contents of iTunes to be copied to the iPad.

EA6900 Antenna's for maximum signal and low noise

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